Autoren:	Lange, Martin Alexander Khan, Ibrahim Opitz, Phil Hartmann, Jens Ashraf, Muhammad Qurashi, Ahsanulhaq Prädel, Leon Panthöfer, Martin Cossmer, Antje Pfeifer, Jens Simon, Fabian Au, Marcus von der Meermann, Björn Mondeshki, Mihail Tahir, Muhammad Nawaz Tremel, Wolfgang
Titel:	A generalized method for high-speed fluorination of metal oxides by spark plasma sintering yields Ta3O7F and TaO2F with high photocatalytic activity for oxygen evolution from water
Online-Publikationsdatum:	26-Apr-2022
Erscheinungsdatum:	2021
Sprache des Dokuments:	Englisch
Zusammenfassung/Abstract:	A general method to carry out the fluorination of metal oxides with poly(tetrafluoroethylene) (PTFE, Teflon) waste by spark plasma sintering (SPS) on a minute scale with Teflon is reported. The potential of this new approach is highlighted by the following results. i) The tantalum oxyfluorides Ta3O7F and TaO2F are obtained from plastic scrap without using toxic or caustic chemicals for fluorination. ii) Short reaction times (minutes rather than days) reduce the process time the energy costs by almost three orders of magnitude. iii) The oxyfluorides Ta3O7F and TaO2F are produced in gram amounts of nanoparticles. Their synthesis can be upscaled to the kg range with industrial sintering equipment. iv) SPS processing changes the catalytic properties: while conventionally prepared Ta3O7F and TaO2F show little catalytic activity, SPS-prepared Ta3O7F and TaO2F exhibit high activity for photocatalytic oxygen evolution, reaching photoconversion efficiencies up to 24.7% and applied bias to photoconversion values of 0.86%. This study shows that the materials properties are dictated by the processing which poses new challenges to understand and predict the underlying factors.
DDC-Sachgruppe:	540 Chemie 540 Chemistry and allied sciences
Veröffentlichende Institution:	Johannes Gutenberg-Universität Mainz
Organisationseinheit:	FB 09 Chemie, Pharmazie u. Geowissensch.
Veröffentlichungsort:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-6903
Version:	Published version
Publikationstyp:	Zeitschriftenaufsatz
Nutzungsrechte:	CC BY-NC-ND
Informationen zu den Nutzungsrechten:	https://creativecommons.org/licenses/by-nc-nd/4.0/
Zeitschrift:	Advanced materials 33 20
Seitenzahl oder Artikelnummer:	2007434
Verlag:	Wiley-VCH
Verlagsort:	Weinheim
Erscheinungsdatum:	2021
DOI der Originalveröffentlichung:	10.1002/adma.202007434
Enthalten in den Sammlungen:	JGU-Publikationen